ABSTRACT
The stations are being built top-down to a depth of about NAP −31 m at Vijzelgracht, with 1.2 m thick diaphragm walls extending to a depth of approximately NAP −45 m. See Figure 1. The diaphragm
1 INTRODUCTION
1.1 North South line Amsterdam
The North-South Line in Amsterdam is 9.5 kilometres long. This metro line starts at street level in the North of Amsterdam and passes under the historical centre of the city in a twin shield tunnel. South of the historic centre, the line reemerges at street level between the RAI conference centre and the existing railway station South/ WorldTradeCentre. Five underground stations are under construction. Diaphragm walls support the excavations of the three deep inner city stations: Rokin (RKN), Vijzelgracht (VZG) and Ceintuurbaan (CTB). This paper deals with the leakages that occurred at Vijzelgracht resulting in severe settlement of monumental buildings, exceeding project budgets and time schedule. After a short description of the events the paper will focus on the lessons learned.
